The AISLink CB2 AIS Transponder is a fully compliant, waterproof Class B+ transceiver designed to help with marine traffic collision avoidance. Using advanced SOTDMA (Self Organized Time Division Multiple Access) technologies from Class A transponders, the AISLink CB2 features inherent advantages, including a faster reporting rate and higher output power concerning all Class B AIS products that use the older CSTDMA (Carrier Sense Time Division Multiple Access) technologies on the market. 

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*A link to download firmware update software and the corresponding instructions on doing the firmware update are included at the end of this section

Using technology from Class A AIS, the CB2 has a faster reporting rate with reserved time slots for transmissions to ensure your broadcast does not get blocked in high traffic areas.  The AISLink CB2 will transmit every 5 seconds while older Class B AIS units can only transmit once every 30 seconds.  The CB2 also transmits at 5 watts of power, versus older Class B AIS that only transmit at 2 watts, broadcasting to a larger area for improved visibility. 

Utilizing 99 acquisition channels and 33 tracking channels, the internal multi-GPS receiver continuously transmits your vessel information including position, speed, course, and heading, ensuring an indication of the most accurate global positioning at all times. In addition to transmission of dynamic vessel information, the AISLink CB2 also continuously transmits static information including vessel name, call sign, vessel type, vessel dimensions, and MMSI number. 

Programming static information into the AISLink CB2 proves effortless as the user has the ability to simply upload this information via Wi-Fi using ACR’s free mobile app. For increased flexibility for the maximum number of users, the app is conveniently available from either the App Store (Apple) or the Google Play Store (Android). 

Upon completion of the quick and easy installation process, the AISLink CB2 receives and interprets messages from other AIS-equipped vessels within range and then seamlessly communicates this information to other navigation devices on your vessel such as chart plotters, laptops, or mobiles using the CB2’s NMEA 0183, NMEA 2000®, USB or WiFi outputs.

A primary benefit that users can rely on is the transmission priority provided by the AISLink CB2 due to the use of the SOTDMA access scheme versus CSTDMA. The use of SOTDMA guarantees the same AIS transmission priority as a class A transponder, ensures a faster reporting rate with transmissions every 5 seconds instead of every 30 seconds, and also ensures a higher output power of 5 Watts instead of 2 Watts. These features not only allow the CB2 to convey a more “real-time” picture of your vessel’s position but also enables your transmissions to reach further.

Additional benefits include a multi-color LED indicator light communicating the ongoing operational status of the unit. Given that the CB2 also comes complete with an external GPS antenna, users have the ability to be transmitting AIS messages and enjoying the many benefits of the AISLink CB2 within minutes of install.   

The AISLink CB2 provides a significant advantage in navigational safety, giving you the peace of mind that your vessel will be seen day or night on even the busiest waterways, regardless of what the weather may be.

As a leader in life-saving marine products for both professional and recreational use, ACR provides unparalleled safety and peace of mind with the AISLink CB2 AIS Transceiver.

Features and Benefits:

  • 5 Watts of Power – More than double that of older Class B units
  • 12 Times the Transmissions Per Minute – 12 Times Versus 2 transmissions with CSTDMA
  • Guaranteed Time Slot Reservations
  • Increased visibility to other vessels
  • FREE user-friendly mobile app for set up and controls
  • Wi-Fi, USB, NMEA 0183, and NMEA 2000 connectivity
  • Simple to install and use
  • Superior internal 99-channel GPS receiver
  • External GPS antenna (Included)
  • Multi-color LED indicator light
  • Receives and interprets messages from other AIS-equipped vessels
  • Durable waterproof design
  • Low energy consumption

Firmware Update:

Link to download Firmware Update Software

SIL (Service Information Letter) 4016 – AISLink CB2 Firmware Update

Download the firmware update software via the link above and then follow the instructions in SIL4016 (see link above) to complete the update (Instructions also provided below):

Instructions on Completing the Firmware Update:

If your CB2 is already installed, use the instructions on the left side of the table below. If your CB2 has not been installed yet, follow the instructions on the right side of the table below. 

Installed Unit

Boxed Unit


Download the zip file (see link above) and unzip it to a USB stick* (Do not drag the entire folder)

Download the zip file (see link above) and unzip it to a USB stick* (Do not drag the entire folder)


Ensure the systemb.bin file is in the top-level directory and not in a folder

Ensure the systemb.bin file is in the top-level directory and not in a folder


Power down the CB2

Remove the CB2 unit, USB On-the-Go cable, and power cable from the box


Connect the USB stick to the CB2 using the USB on-the-go cable supplied

Connect the USB stick to the CB2 using the USB on-the-go cable supplied


Power up the CB2

Connect the power cable to a 12V dc Power Supply or battery


The LED will flash amber then green 6 times then turn to flash red

The LED will flash amber then green 6 times then turn to continuous red


After a short wait (while the GPS obtains a fix) the LED will turn green

Disconnect the power supply


Press and hold the LED button for 10 seconds (until it flashes Amber) to eject the USB stick

Remove the USB cable and stick


It is now safe to remove the USB stick

Return the CB2, USB On-the-Go cable, and power cable to the box


The CB2 will return to normal operation

Additional information

Weight 2.93 lbs
Dimensions 13 × 8.60 × 3.90 in
Boat Size

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Boat Type

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Product Name: AISLink CB2 Automatic Identification System
Product Description: Class B AIS Transceiver
Application: Coastal Cruising, Sailing, Offshore Recreational, Charters, Workboats
Waterproof: IPx7 (1 meter for 30 minutes)
Weight: 0.36kg / 0.8lbs
Warranty: 2 Years (plus 1 on registration)
Dimensions: 101 x 162 x 58mm
Temperature Range:  Operational: -5°F to +131°F (-15°C to +55°C)
AIS Transmitter Frequency range: 156.025 – 162.025 MHz
Receiver Sensitivity: 107dBm for 20% packet error rate
AIS Receiver Frequency range: 156.025 – 162.025MHz
Transmit Power (EIRP): AIS – 5 Watt
Power Supply: 10.8 – 31.2 Vdc
GPS receiver: High Sensitivity, 99 acquisition/33 tracking
Serial Ports:

NMEA 0183 [2 Rx, 2 Tx]
NMEA2000® [DeviceNet]
1 x USB
1 x WiFi IEC802.11 bgn

WARRANTY LENGTH:  2 YEARS + Extend your warranty 1 Year creating an account during set-up allowing ACR to send you information and updates regarding this product.

Limited Warranty

ACR Electronics will at its discretion, repair or replace the faulty products free of charge excluding the cost of shipping. Proof of purchase shall be required for a warranty claim to be valid from the original purchaser. All claims shall be made in writing to ACR Electronics or an approved service dealer or distributor. ACR Electronics shall not be liable to the buyer under the above warranty:

  • for any repairs or modifications carried out using parts not supplied or approved by ACR Electronics and for work carried out other than by ACR Electronics or approved service dealers,
  • for any part, material, or accessory that is not manufactured by ACR Electronics the consumer will be covered by the warranty offered to ACR Electronics by the manufacturer or supplier of such a component,
  • for a product that has not been fully paid for,
  • for any product supplied by ACR Electronics to a customer under an alternative warranty or commercial agreement, for the cost of shipping product to and from the customer.

This warranty does not affect your statutory rights. This warranty is to be interpreted under United States law.


For further assistance please contact our Technical Service Department.


ACR Electronics, Inc.

5757 Ravenswood Road, Fort Lauderdale, FL 33312


Telephone: +1 (954) 981-3333

Fax: +1 (954) 983-5087

What information is transmitted?

Position reports (MMSI, Lat, Long, COG, SOG)  for Class B (SOTDMA)

  • Every 3mins. when SOG < 2 knots
  • Every 30s when SOG >= 2 knots < 14 knots
  • Every 15s when SOG >= 14 knots < 23 knots
  • Every 5s when SOG > 23 knots

Vessel data (Name, call sign, dimensions, type, etc.)

  • Every 6mins.

This means that if you are moored or in the marina your data may take some time to be visible on other people’s systems.  Depending on your location visibility on Marine Traffic or Shipfinder websites may take much longer.

Can I use an existing GPS receiver or GPS data instead of installing an additional GPS antenna for the AIS?

No. The use of the internal GPS receiver is a requirement of the AIS regulations.  The AIS can be used as a position source output by configuring it to output GPS position data (RMC NMEA sentence) although this is not generally recommended.

Can I change the MMSI or vessel details?

Always take great care when entering the MMSI number.  Once programmed changing the MMSI number will require the AIS to be ‘unlocked’ by contacting ACR Electronics via the set-up app. This could take up to 2 days.  Changing all other details entered is simple using the Mobile or Web-based set-up apps.  Download the ACR AIS App on the App Store or Google Play.

How do I connect my CB2 AIS to my existing navigation electronics?

The CB2 comes with both NMEA0183 and NMEA2000 communication protocols.

To connect using NMEA0183 you will require some suitable connector block and the wiring information for your other manufacturer’s equipment.

To connect using NMEA2000 you will require a spur (drop) cable suitable to connect to the DeviceNet (male) connector on the AIS to an existing NMEA2000 backbone. An unused connection on the backbone must be available.

What type of radio antenna should I use?

The CB2 AIS transmits and receives on the VHF band so any good quality Broad Band Marine Grade VHF antenna will be suitable.

There are antennas specifically tuned for AIS which are available and are suitable but other narrowband antennas or antennas specifically tuned for VHF radio should be avoided. If a single antenna is to be used by VHF radio and the CB2 then an active antenna splitter should be installed.

What is the range of AIS?

This varies enormously depending on weather, VHF antenna height, etc.

  • The typical transmit range for Class B is 10nm
  • The typical receive range for Class A targets is 20nm
  • Receive range can exceed 100nm in the right conditions

How do I configure my CB2 AIS?

The CB2 AIS needs to be configured by the user to enter the vessel’s MMSI number and other vessel details.
This can be carried out by a mobile app or a web-based program:

  • For the Mobile Android version search the Playstore for ACR AIS Config
  • For the Mobile iOS, version search the App Store for ACR AIS Config
  • For the Web, version click here: CB2 New Configuration Program

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